BZ #1123312 - increase galera pacemaker start timeout

https://bugzilla.redhat.com/show_bug.cgi?id=1123312

Increase galera start timeout to allow a sufficient amount
of time for syncing to occur between galera modes.
Merge pull request #347 from cwolferh/bz1123312_galera_op_start_timeout

BZ #1123312 - increase galera pacemaker start timeout